How to add the MCB 105 option:• The power to the adjustable frequency drive must be disconnected.• The power to the live part connections on relay terminals must be disconnected.• Remove the LCP, the terminal cover and the LCP fixture from the FC 30x.• Fit the MCB 105 option in slot B.• Connect the control cables and fasten them with the enclosed cable strips.• Make sure the length of the stripped wire is correct (see the following drawing).• Do not mix live parts (high voltage) with control signals (PELV).• Fit the enlarged LCP fixture and enlarged terminal cover.• Replace the LCP.• Connect power to the adjustable frequency drive.• Select the relay functions in par. 5-40 [6-8], 5-41 [6-8] and 5-42 [6-8].NB (Array [6] is relay 7, array [7] is relay 8, and array [8] is relay 9)Do not combine 24/ 48 V systems with high voltage systems.8.1.12. 24 V Backup Option MCB 107 (Option D)External 24 V DC SupplyAn external 24 V DC supply can be installed for low-voltage supply to the control card and anyoption card installed. This enables full operation of the LCP (including the parameter setting)without connection to line.External 24 V DC supply specification:Input voltage range 24 V DC ±15% (max. 37 V in 10 s)Max. input current 2.2 AAverage input current for FC 302 0.9 AMax. cable length 246 ft [75 m]Input capacitance load < 10 uFFC 300 Design Guide 8. Options and AccessoriesMG.33.B9.22 - VLT® is a registered Danfoss trademark. 1598
